Answer:
x = 3
Step-by-step explanation:
subtract 7 from both sides, then subtract 4x from both sides after
6x +7 = 4x + 13
-7 -7
6x = 4x +6
-4x -4x
2x = 6
divide both sides by 2x
answer x =3
Simplified 4x+4y+4z
Unless in your unit or your teacher taught you there is nothing further you can do.
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The 15th arrangement will have both a blue and red ribbon